28315961857 has 2 divisors, whose sum is σ = 28315961858. Its totient is φ = 28315961856.

The previous prime is 28315961809. The next prime is 28315961887. The reversal of 28315961857 is 75816951382.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 28182351376 + 133610481 = 167876^2 + 11559^2 .

It is a cyclic number.

It is not a de Polignac number, because 28315961857 - 2²³ = 28307573249 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 28315961798 and 28315961807.

It is not a weakly prime, because it can be changed into another prime (28315961887) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14157980928 + 14157980929.

It is an arithmetic number, because the mean of its divisors is an integer number (14157980929).

Almost surely, 2^28315961857 is an apocalyptic number.

It is an amenable number.

28315961857 is a deficient number, since it is larger than the sum of its proper divisors (1).

28315961857 is an equidigital number, since it uses as much as digits as its factorization.

28315961857 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3628800, while the sum is 55.

The spelling of 28315961857 in words is "twenty-eight billion, three hundred fifteen million, nine hundred sixty-one thousand, eight hundred fifty-seven".